代码对象
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Code objects are a low-level detail of the CPython implementation.
Each one represents a chunk of executable code that hasn't yet been
bound into a function.

PyCodeObject

   The C structure of the objects used to describe code objects.  The
   fields of this type are subject to change at any time.

PyTypeObject PyCode_Type

   This is an instance of "PyTypeObject" representing the Python
   "code" type.

int PyCode_Check(PyObject *co)

   Return true if *co* is a "code" object.

int PyCode_GetNumFree(PyCodeObject *co)

   Return the number of free variables in *co*.

PyCodeObject* PyCode_New(int argcount, int kwonlyargcount, int nlocals, int stacksize, int flags, PyObject *code, PyObject *consts, PyObject *names, PyObject *varnames, PyObject *freevars, PyObject *cellvars, PyObject *filename, PyObject *name, int firstlineno, PyObject *lnotab)

   Return a new code object.  If you need a dummy code object to
   create a frame, use "PyCode_NewEmpty()" instead.  Calling
   "PyCode_New()" directly can bind you to a precise Python version
   since the definition of the bytecode changes often.

PyCodeObject* PyCode_NewEmpty(const char *filename, const char *funcname, int firstlineno)

   Return a new empty code object with the specified filename,
   function name, and first line number.  It is illegal to "exec()" or
   "eval()" the resulting code object.
